Bond for two-membered concrete building-blocks.



L. B. LARSEN'.

BOND FOR TWO MEMBERBD CONCRETE BUILDING BLOCKS. I APPLICATION FILED FEB.17, 1908.

iatented Nov. 23, 1909.

U IT D STATES; PATENT LUDWIG B. LA$EL OF PORTLAND, OREGON.

seiner; e

To alt whom i Be it 1.1355 1, iJUnwIc B. LARSEN, a citizen of the United States, and a resident of Portland, in. the county of Multnomah and Stateof Oregon, have invented a new and useful Improvement in Bonds for Two- Membered Concrete Buildin Blocks, of which the following is a speci cation, reference being-had to the' accompanying drawings as constituting a part thereof.

This invention relates to the present well known system of two-membered construction of concrete building blocks; in other words, to the system of concrete buildingblocks made of two pieces, separated from,

each othe r by an intermediate air-passage, and the two members of which are integrally united by a metallic bond; and my invention has for its object" to obtain a simply con structed, inexpensive and effective metallic bond by which to efiect integral unity of said two members of the concrete blocks.

aObviously, the parts must be sh arranged that the metallic bond and the, concrete mass Heretofore have a firm hold off each other. the general method of construction ofsaid metallic bonds consisted in "the use of metallic strips having apertures throiigh which the concrete penetrated, formingan integral bridge through such openings and abutting against or locking, as it were, with the shoulder-edges of the metal encompassing said openings.

Since inall constructionsof the nature referred to, the force of expansion and contraction has to be taken into account, it is desirable to distribute the-consequent strain as much as possible; and, furthermore, said shoulder-edges, of the apertures mentioned, offerin necessarily only a. very narrow surface, t e construction is not as perfect in oiiieeticn of Eetters Patent. P3$gmtei N 2'3 331 implication filed February 17, 1908.

Serial No. $16,406.

erence to the drawings above referred to, in which,

Figures 1, 2, and 3 represent three difien ent types of construction of my improved metallic bond, said types to be more specifically explained in the body of this specification; Fig. 4 shows the arrangement of my metallic bond, when to be used for uniting right-angle courses or corner blocks of a wall; Fig. 5 represents an end elevation of a two rnembered concrete block embodying my improvedmetallic bond; Fig. 6 is a top View of the same type of block shown in.

Fig. 5 and Fig. 7 is a top view ofa corner block.

The letters designate the parts described. My bond is conveniently stamped out of a piece of sheet steel, and when. of the type shown in Fig. 1, it consists of an oblong strip a, made with apertures b, c, at its ends, which apertures are obtained by cutting out therefrom portions (Z, c, which are then turned at right angles to the face of the strip, as shown, so as to constitute flangelike braces projectin from the main body.

In practice the bond of the type shown in Fig. l is embedded in the concrete mass, as illustrated in Figs. 5-and 6, in the process of making such concrete blocks, the same as hereto ore "done.

Instead of making my bond of the type ,shown in Fi 1, the same may be made oigreater widt as in the type illustrated in Fig. 3, comprising a body portion f, of greater width than the body portion a, shown in Fig. 1, and so as to be adapted to have two courses of flange-braces g, g andh, it; said courses being arranged one above the other, and the said flangebraces g, g, h,

it being turned in opposite directions. This I type of construction may be preferred where great solidity and strength are to be obtained in the wall to be built of my improved concrete blocks; and is especially adapted for larger sized blocks.

The type of bond illustrated in Fig. 3 would be embedded in the concrete mass in the process of making the concrete blocks, the same as described concerning the type Fig.1.

For extra heavy work, where still greater rigidity in construction is desired, a t e of block construction as illustrated in F 1g; 2 may be made. The same consists of a bandlike body 2', made of a single piece and formed in rectangular shape, the ends meetjecting flanges also serve to distribute the 60 ing as at i, thus being embedded, finally, in strain imposed upon the members of the conthe center of the block; and said body 2' crete block during the setting of the conbein made with a series of fiange-braces j, crete mixture, and by thermal conditions. 5 obtained by cutting out rectangular portions lVhile I have described my improved bond of the sides and turning the same at right as made by stamping the same out of a piece 65 angles to the body of the bond-strip, subof sheet steel,,yet, of course, I do not limit stantially the same as above described and myself tosuch methods of manufacture, for shown. the same may be a metal casting if con- Where right angle courses, or corners, in venient and economical to do so. the wall construction is required, I use for I claim: v such corner members a bond of the construcl. The combination with abuilding block tion illustrated in Fig. 4:, resembling in its comprising two members arranged in spaced general ap earance the type illustrated in relation, of a bond connecting said members,

, Fig. 1, an comprising a body 70, having said bond comprisingametallic strip formed portions Z cut out, so as to leave fiangenear each end with an aperture, the material 75 braces m; the body is being bent at the cencut from the strip to form the aperture beter so as to conform to a right angle figure, ing integral with the strip along one edge and. the flange-braces m being preferably and being bent at right angles to the strip to arranged so as to project from the opposite form flanges, the strip being embedded in sides thereof; and it is also to be noted that the block members at right angles to the ad- 80 I both at the ends of the body is and at the longitudinally of and wholly embedded in central bent portion thereof. the members, the ends of the strip being em- The method of embedding my corner bedded in the members so as to expose a bond, just described, in the members of the portion of each aperture beyond the inner 85 concrete block is illustrated in Fig. 7 which face of the member, whereby to provide an figure also shows an additional bond of the unbroken face section of each member for type illustrated in Fig. 1. a height corresponding approximately to the A bond of the type illustrated in Fig. 2 width of the aperture to avoid weakening would be embedded in its concrete mass the member at the point of application of the 90 transversely substantially in the same way strip. Y as described concerning the embedding of 2. The combination with a corner block bonds of the type illustrated in Figs. 1 and l including two members having connected 3. The physical advantages of a bond of right angled sections, the corresponding seethe type Fig. 2, for the purpose specified, tions of each member being arran ed in 95 are manifest. j spaced parallel relation, of a bond for the n, 72/ represent the members of a common 1 members including a right angled strip two-part concrete building-block, and 0, 0' formed with apertures adjacent each end the members of a corner concrete buildingand adjacent and on each side of the angle,

block. The apertures b, c, in the type illusthe material cut from the strip being in- 100 trated in Fig. l, the aperture 7', in the type j tegral therewith along one. edge to form illustrated in Fig. 2,'the aperture h of the flanges, the strip being embedded in the type illustrated in Fig. 3, and the apertures members with the flanges adjacent the angle Z, of the type illustrated in Fig. i, have the of the strip embedded in one member and common purpose of allowing the concrete \the flanges adjacent the ends of the strip 105 the apertures l and flan es m are provided jacent faces thereof with flanges extending mass to form an integral bridge between embedded in the other member, the respecthe cement material encompassing the sidetive portions of the strip embedded in the members being arranged to expose a 3ort1on faces of the body of the bond, and thus effectin a unit of construction of the blocks of each aperture beyond the inner ace of said member, whereby to provide an un- 110 and their bonds as a whole; and the flanges projecting at right angles from the bond broken face section of each member correstrips add rigidity to the body of the bond, spending approximately to the width of the allogv thg concrgtefmateriall to take a fifrmer aperture.

hol ,an rovi e or thecistribution 0 an I 1 strain, tha t is, any outward pull or inward LUDXVIG LARSEIN' push exerted by my bond upon either one or \Vitnesses: both of the opposed faces of the two meml \V. A. CLELAND, bers of the concrete block; and said pro- 1 T. J. GnIsLER. 

